ES6 Feature Proposals

These ES6 feature proposals are not yet final. Read about the Harmony process to learn more about proposal status.

ES6 reached "proposal freeze" in May, 2011: no new major proposals can be added, although proposals can still be removed. TC39 is targeting a release date of December, 2013 for the official ES6 standard, but JS engines are implementing individual features before the spec is finalized.

Scoping

• block scoping
• destructuring
• default parameter values
• rest parameters
• spread

Modularity

• modules
• standard modules
• multiple globals
• object literals
• classes
• symbols

Control

• proper tail calls
• iterators
• for-of loop
• generators
• array comprehensions
• generator expressions
• arrow functions

Collections

• weak map
• maps and sets

Virtualization

• proxies
• loaders

Data

• binary data
• template strings

API improvements

• Array improvements
• Object.is
• Number improvements
• regexp improvements
• String improvements
• Math improvements
• Function improvements

Breaking changes

• completion reform